package org.opencv.core;

//javadoc:Range
public class Range {

	public int start, end;

	public Range(int s, int e) {
		this.start = s;
		this.end = e;
	}

	public Range() {
		this(0, 0);
	}

	public Range(double[] vals) {
		set(vals);
	}

	public void set(double[] vals) {
		if (vals != null) {
			start = vals.length > 0 ? (int) vals[0] : 0;
			end = vals.length > 1 ? (int) vals[1] : 0;
		} else {
			start = 0;
			end = 0;
		}

	}

	public int size() {
		return empty() ? 0 : end - start;
	}

	public boolean empty() {
		return end <= start;
	}

	public static Range all() {
		return new Range(Integer.MIN_VALUE, Integer.MAX_VALUE);
	}

	public Range intersection(Range r1) {
		Range r = new Range(Math.max(r1.start, this.start), Math.min(r1.end, this.end));
		r.end = Math.max(r.end, r.start);
		return r;
	}

	public Range shift(int delta) {
		return new Range(start + delta, end + delta);
	}

	public Range clone() {
		return new Range(start, end);
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		long temp;
		temp = Double.doubleToLongBits(start);
		result = prime * result + (int) (temp ^ (temp >>> 32));
		temp = Double.doubleToLongBits(end);
		result = prime * result + (int) (temp ^ (temp >>> 32));
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!(obj instanceof Range))
			return false;
		Range it = (Range) obj;
		return start == it.start && end == it.end;
	}

	@Override
	public String toString() {
		return "[" + start + ", " + end + ")";
	}
}
